Abstract
The model checking problem for finite-state open systems (module checking) has been extensively studied in the literature, both in the context of environments with perfect and imperfect information about the system. Recently, the perfect information case has been extended to infinite-state systems (pushdown module checking). In this paper, we extend pushdown module checking to the imperfect information setting; i.e., the environment has only a partial view of the system’s control states and pushdown store content. We study the complexity of this problem with respect to the branching-time temporal logic CTL, and show that pushdown module checking, which is by itself harder than pushdown model checking, becomes undecidable when the environment has imperfect information. We also show that undecidability relies on hiding information about the pushdown store. Indeed, we prove that with imperfect information about the control states, but a visible pushdown store, the problem is decidable and its complexity is the same as that of (perfect information) pushdown module checking.
Work supported in part by MIUR FIRB Project no. RBAU1P5SS, NSF grants CCR-9988322, CCR-0124077, CCR-0311326, CCF-0613889, and ANI-0216467, by BSF grant 9800096, and by gift from Intel.
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Aminof, B., Murano, A., Vardi, M.Y. (2007). Pushdown Module Checking with Imperfect Information. In: Caires, L., Vasconcelos, V.T. (eds) CONCUR 2007 – Concurrency Theory. CONCUR 2007. Lecture Notes in Computer Science, vol 4703. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-74407-8_31
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